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Bio 201 Practice Quiz 3 Name_____________________________
Chapter 2: Chemistry Comes Alive: Organic Compounds
I. Match the terms in Column B with the corresponding descriptions in Column A. Enter the correct letters in the answer blanks next to each number.
Column A Column B
___1. Building blocks for all carbohydrates A. Amino acids
___ 2. ___3.Building blocks of triglycerides B. Carbohydrates
___4. Building blocks of protein C. Lipids (fats)
___ 5. Building blocks of nucleic acids D. Fatty acids
___ 6. This class of molecules include glycogen and starch E. Glycerol
___7. ___8. ___9. These are not highly soluble in water F. Nucleotides
___ 10. Contains C, H, and O in the ratio C:H 2 :O G. Monosaccharides
___11. Contain mostly CH 2 plus a carboxyl group H. Proteins
___12. ____13. These contain N in addition to C, H, & O I. Steroids
___14. These contain P in addition to C, H, O, and N J. Phospholipids
___15. 75% of the lipid in the cell membranes.
___14. Primary components of meat and cheese
___15. Primary components of bread and lollipops
___16. Primary components of egg yolk and peanut oil
___17. Includes hemoglobin and lactase
___18. Class that usually includes cholesterol
___19. Eicosanoids are derived from these
___20. There are 20 different types of these
II. Draw the structure that represents each of the following functional groups:
Carboxyl: Hydroxyl:
Amine: Phosphate:
Chapter 3: The Plasma Membrane: Structure and Function
III. Figure 1 is a diagram of a portion of a plasma membrane. Select four different colors and color the coding circles and the corresponding structures in the diagram. Then respond to the questions that follow, referring to Figure 3.1 and inserting your answers in the answer blanks.
O Phospholipid molecules
O Protein molecules
O Carbohydrate molecules
Figure 1
- Which molecule “A” or “E” is always located on the intracellular side of the plasma membrane? _____
- What is the function of cholesterol molecules in the plasma membrane? _________________________
- Name the carbohydrate-rich molecules indicated by bracket at the top surface._______________________
- Which label: B or C points to the nonpolar region of a phospholipid molecule? _____________________
- Does nonpolar mean hydrophobic or hydrophilic? _________________________________________
- Which label, D or E, indicates a peripheral protein and which an integral protein? __________, ________
A
V. Given the following substances: O 2 , Na+, Cl-, amino acids, glucose, CO 2 , K+, H 2 O, and steroids
- Which 3 substances can easily move by simple diffusion across lipid-containing cell membranes?
- Which of the remaining substances cannot dissolve into lipid and thus must enter or leave the cell by protein- based carriers or pores? ____________________________________________________________________
- Which one substance is able to move passively across the membrane by diffusion through aquaporin channels or pores? ____________________________
- Which 2 of the substances are also known to be transported across the membrane by a primary active transport mechanism? _______________________________________________________
- Identify the one substance that is known to be transported along with sodium via a secondary active transport mechanism __________________.
VI. Figure 2 shows three microscope fields containing red blood cells. Arrows indicate the direction of net osmosis. Respond to the questions below.
A B
Figure 2
- Identify the osmolarity of the fluid surrounding the cells in A, B, and C.
A. ___________________________B. ____________________________ C. ____________________________
- Describe what is happening to the cells in diagrams A, B, and C.
A. ___________________________B. ____________________________ C. ____________________________
- What does hyperosmotic mean in terms of solute & H 2 O concentration?
- Why is the cell in diagram C bursting?
